Script to update "Display Name in Active Directory

In my AD 2003 environment (Exchange 2003) I need help with a script that will update the "Display Name" so that it matches the data contained in the "lastname, firstname" field(s) - Can a script take the existing data and populate/overwrite the current "Display Name" data with the data currently resident in the full name fields?
I can use either ldifde or VBS - or anything else that will successfully apply the update... As does everyone else, I need this ASAP but this is for a major client of mine and I will award max points... Thanks in advance!!

In this video we show how to create a Distribution Group in Exchange 2013. We show this process by using the Exchange Admin Center.
Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center.
Navigate to the Recipients >>…

In this video we show how to create an email address policy in Exchange 2013. We show this process by using the Exchange Admin Center.
Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center.
Navigate to the Mail Flow…